Add test case for binding using each block value

test/runtime/samples/binding-this-component-each-block-value/Foo.svelte

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+<div>foo</div>

test/runtime/samples/binding-this-component-each-block-value/_config.js

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+export default {
+	skip_if_ssr: true,
+
+	html: `
+		<div>foo</div>
+		<div>first has foo: true</div>
+		<div>foo</div>
+		<div>second has foo: true</div>
+		<div>foo</div>
+		<div>third has foo: true</div>
+	`
+};

test/runtime/samples/binding-this-component-each-block-value/main.svelte

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+<script>
+	import Foo from './Foo.svelte';
+	export let foo = {};
+</script>
+
+{#each ["first", "second", "third"] as value}
+	<Foo bind:this={foo[value]}/>
+	<div>
+		{value} has foo: {!!foo[value]}
+	</div>
+{/each}